NEW YORK - A second son of an Iraqi diplomat has been indicted on charges that he secretly gave information to Iraqi intelligence agents about Iraqi dissidents living in the United States, federal prosecutors said on Friday.

Wisam Noman al-Anbuke, 24, was added to an indictment against his brother, Raed Roman al-Anbuke, 29, who was charged in April. The brothers pleaded not guilty on Friday in Manhattan federal court, Reuters said.

Although court documents spell their last name as al-Anbuke, a defense lawyer in the case said the men go by al-Anbuge.

The men are the sons of Rokan al-Anbuke, who was deputy permanent representative to Iraq's UN Mission until Aug. 1, 2000, when he returned to Iraq. His sons remained in New York.

Thomas Nooter, a lawyer representing Raed al-Anbuke, said the father is currently a high-ranking official in the Iraqi transitional government's foreign ministry.

Nooter said his client was outraged. "He's extremely confident he's going to be exonerated," Nooter said. "I'm anxious to resolve this as soon as possible."

Nooter told U.S. District Judge Michael Mukasey that he planned to submit a motion seeking dismissal of the case on grounds that the defendants had diplomatic immunity at the time the alleged crimes were committed.

The indictment accuses them of conspiring to act as agents of the Iraqi Intelligence Service, or IIS, and failing to register with the Justice Department as an agent for a foreign government. Prosecutors said the intelligence service had helped carry out terrorist operations, including the attempted assassination of former President George W. Bush and attempted bombings during the 1991 Persian Gulf War. They said that the Iraqi service has also "located, intimidated and killed Iraqi defectors and dissidents living abroad."

The expanded indictment charges that in October or November 2001, Wisam al-Anbuke gave information to the IIS about two Iraqi dissidents living in the United States. This information included the location and employment of the dissidents, according to the indictment.

It also charges that he lied to the FBI about providing this information to the IIS.

New charges against Raed al-Anbuke accuse him of providing the IIS with the location, employment, and family status of Iraqi expatriates in the United States.

If convicted on all counts, Wisam al-Anbuke could be sentenced to a maximum of 35 years in prison and Raed al-Anbuke to 15 years.